Question 1

Which of the following elements is represented by the symbol 'X' in the isotope notation $^{35}_{17}X$?

Accepted Answer

Chlorine

Question 2

How many protons, neutrons, and electrons are present in $^{18}_{8}O^{2-}$?

Accepted Answer

8 protons, 10 neutrons, 10 electrons

Question 3

Which of the following ions is isoelectronic with argon ($Ar$)?

Accepted Answer

$Cl^-$

Question 4

Predict the charge of a phosphorus ion.

Accepted Answer

$-3$

Question 5

What is the mass (in grams) of $2.25 	imes 10^{24}$ atoms of nickel ($Ni$)? (Atomic mass of Ni = 58.69 g/mol)

Accepted Answer

$219$ g

Question 6

How many atoms are present in $2.78$ g of barium ($Ba$)? (Atomic mass of Ba = $137.33$ g/mol)

Accepted Answer

$1.22 	imes 10^{22}$

Question 7

Calculate the wavelength (in nm) of the light with a frequency of $3.0 	imes 10^{14}$ Hz. ($c = 3.00 	imes 10^8$ m/s)

Accepted Answer

$1.00 	imes 10^3$ nm

Question 8

What is the de Broglie wavelength of an electron traveling at $2.11 	imes 10^6$ m/s? (mass of electron $= 9.11 	imes 10^{-31}$ kg, $h = 6.626 	imes 10^{-34}$ J·s)

Accepted Answer

$3.42 	imes 10^{-10}$ m

Question 9

Which of the following transitions would require the absorption of a photon of light with the shortest wavelength?

Accepted Answer

$n=1$ to $n=2$

Question 10

How many orbitals are there in the third shell ($n=3$)?

Accepted Answer

9

Question 11

What is the maximum number of electrons that can occupy a $d$ subshell?

Accepted Answer

10

Question 12

How many significant figures should the answer have for $2.42 	imes 3.7 	imes 7.8005$?

Accepted Answer

2

Question 13

Which of the following atoms or ions is paramagnetic?

Accepted Answer

$O$

Question 14

Which atom has the ground state electron configuration $1s^2 2s^2 2p^6 3s^2 3p^3$?

Accepted Answer

Phosphorus

Question 15

Rank the following atoms in order of increasing ionization energy: $P$, $O$, $Na$, and $F$.

Accepted Answer

$Na < P < O < F$

Question 16

Which of the following is the correct electron configuration for $Mn^{2+}$?

Accepted Answer

$[Ar]3d^5$

Question 17

How many electrons are in $He^{2+}$?

Accepted Answer

0

Question 18

Which of the following quantum numbers cannot occur together to specify an orbital?

Accepted Answer

$n=2, l=2, m_l=0$

Question 19

Which of the following species is isoelectronic with $S^{2-}$?

Accepted Answer

$Cl^-$

Question 20

What is the effective nuclear charge ($Z_{eff}$) of sodium ($Na$)? (Use Slater's rules)

Accepted Answer

7

General Chemistry I: Practice Problems and Key Concepts Study Guide

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